Crossword Genius

Maintain stronghold (4)

Ross

I believe the answer is:

keep

I believe this is a double definition.

'maintain' is the first definition.
(I know that maintain is a more specific form of keep)

'stronghold' is the second definition.
(I know that keep is a type of stronghold)

(Other definitions for keep that I've seen before include "Stock" , "Guard" , "Retain in old castle (4)" , "Hold - fortress" , "honour" .)

I've seen this clue in The Times and The Guardian.
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